Email Bounce Rate Calculator
Find your email bounce rate and delivery rate.
Results update as you type.
How it works
Bounce rate measures email deliverability, and this calculator computes it along with your delivery rate. You enter the number of emails sent and the number that bounced, and it returns the bounce rate, the delivery rate, and the count of delivered emails. A bounce is an email that could not be delivered and was returned by the receiving mail server, expressed as a percentage of emails sent. Bounces come in two types: hard bounces from permanent problems like invalid or nonexistent addresses, and soft bounces from temporary issues like a full mailbox or a server being down. A low bounce rate, generally under about two percent, indicates a clean, well-maintained list, while a high bounce rate wastes sends and, more importantly, damages your sender reputation. Mailbox providers watch bounce rates to decide whether to trust a sender, so repeated high bounces can land even your valid emails in spam folders or get you blocked. The delivery rate, the complement of the bounce rate, is the share of emails that successfully reached inboxes and forms the basis for other metrics like open rate. To keep bounce rates low, use double opt-in to verify addresses at signup, regularly clean your list by removing hard-bounced and inactive contacts, and avoid buying email lists. Enter your sent and bounce counts to find the bounce rate.
Bounce rate = (bounces / emails sent) × 100
The bounce rate is the percentage of sent emails that could not be delivered and were returned. It divides the number of bounces by the number of emails sent, then multiplies by 100. The delivery rate is the complement, the percentage that did reach recipients. A low bounce rate indicates a clean, healthy list.
Source:Email marketing metrics
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter emails sent and bounces.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Bounce rate updates instantly as you type — no button to press.
Frequently asked questions
What is email bounce rate?
Email bounce rate is the percentage of sent emails that could not be delivered and were returned by the recipient's mail server. It equals bounces divided by emails sent, times 100. A low bounce rate signals a clean, engaged list, while a high one wastes sends and harms deliverability and sender reputation.
What is the difference between hard and soft bounces?
A hard bounce is a permanent delivery failure, such as an invalid, misspelled, or nonexistent email address, and those contacts should be removed. A soft bounce is a temporary failure, like a full inbox or a server being briefly down, which may succeed on a later attempt. Hard bounces are more damaging to sender reputation.
What is a good bounce rate?
Generally, a bounce rate under about two percent is considered healthy for most email programs. Rates above that suggest list quality problems that need attention. Because high bounce rates hurt your standing with mailbox providers, keeping bounces low is essential for maintaining good deliverability of your legitimate emails.
Why do bounces hurt sender reputation?
Mailbox providers judge senders partly by how many emails bounce, since high bounce rates often indicate poor list hygiene or spam-like behavior. A damaged reputation can cause even your valid emails to be filtered to spam or rejected outright, reducing the reach of all your campaigns, not just the bounced ones. This is why controlling bounces matters.
How do I reduce my bounce rate?
Use double opt-in to confirm addresses when people subscribe, regularly clean your list by removing hard-bounced and long-inactive contacts, and never buy email lists, which are full of invalid addresses. Validating addresses at the point of entry and re-engaging or removing dormant subscribers keeps your list healthy and your bounce rate low.